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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f79fd569b7e9e04501de20b40ea08683beb53654fb14330ef965328d64a23f' 
  AND token = 'I/nOxeIeTNGMfrQcN8Ofz4keGBCoU+/H2zXQ4auWuV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}